JPS63292411A - Magnetic head slider - Google Patents

Abstract

PURPOSE:To flatten the medium opposed surface of the periphery of a magnetic core, and also, to prevent such a danger as damages the medium, by forming an alumina layer on resin or glass of the periphery of the magnetic core of the medium opposed surface. CONSTITUTION:In two medium opposed surfaces 11, 12 of a magnetic head slider 10, a magnetic core 20 is fixed by glass 31 to one 11 of them, and an alumina layer 33 is formed on the side of the medium direction surfaces 11, 12 of the glass 31. According to this structure, the medium opposed surface of the periphery of the magnetic core 20 becomes a plane, and the magnetic head slider 10 becomes a desirable floating attitude, and such a danger as the magnetic head slider 10 misses the desirable floating attitude, comes into collision with a medium and gives damage, etc. is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head slider used in a magnetic recording device.

[Conventional technology]

A magnetic head slider for reading and writing data on a magnetic recording medium includes a type in which a magnetic material such as ferrite is embedded in a slider made of a non-magnetic material such as ceramic. This type of magnetic head slider has conventionally been formed by incorporating a magnetic core into a slider made of ceramic or the like, fixing the slider and magnetic core with molten glass, and processing the medium facing surface with two tweezers.

An example of a conventional magnetic head slider manufactured in this manner is shown in Figure 3. The slider 10 has a magnetic core 20 fixedly held on one of two medium facing surfaces 11 and 12 by a glass 31.

The hardness of the glass 31 is lower than that of the slider 10 and the magnetic core. Therefore, during the lapping process, the glass 31
is likely to be selectively polished, and the medium facing surface of the glass 31 (i.e. around the magnetic core 20) has a KO, 0 surface as shown in FIG.
It was normal to have a depression of about 5 to 0.15 μm.

When this conventional magnetic head slider is used as a floating head slider for a hard magnetic disk, negative air pressure is generated in the concave portion of the glass 31, which may impair the desired flying posture and cause the medium to collide with the glass 31. There were cases where the dirt accumulated in the recessed areas came into contact with the medium and caused damage to the medium. Furthermore, when using a conventional magnetic head slider as a type of head slider that slides on a combustible magnetic medium, the medium may be damaged by the engine of the magnetic core 20 exposed by the recess of the glass 31. Ta.

[Problem that the invention seeks to solve]

The problem to be solved by the present invention, that is, the object of the present invention is to solve the problem of the above-mentioned conventional magnetic head slider, which is the dent in the medium facing surface of the glass part, and to create a magnetic head slider with less risk of damaging the medium. Our goal is to provide the following.

[Means for solving problems]

The magnetic head slider of the present invention is a magnetic head slider in which a magnetic core made of a magnetic material is fixed to a non-magnetic slider with resin or glass, in which the resin or glass around the magnetic core on the medium facing surface of the magnetic head slider is It is characterized by having an alumina layer formed on top.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a floating head for a hard disk drive. In FIG. 1, a magnetic core 20 made of Mn-Zn ferrite material is made of calcium titanate (CaT).
iOm) 5 fixed to one of the two medium facing surfaces 11 and 12 of the slider 10 made of ceramic material with a glass 31 Medium facing surfaces 11 and 12 of the glass 31
ftlK forms an alumina (A110m) layer 23. This alumina has a micro Vickers hardness of 700.
Mn-Zn7 elite (micro Vickers hardness 1=
700) and calcium titanate ceramic (micro-Vickers hardness = SOO).

Unlike the conventional magnetic head slider, the glass 31 around the magnetic core 20 is not selectively polished, and as shown in FIG. 2 as a cross section taken along line A-A in FIG. do not have. In this example, a method using RF sputtering was adopted as a method for forming the alumina layer.

First, with the magnetic core 20 welded to the slider IOK glass, the medium facing surfaces 11 and 12 are lapped until one step before the finished state (that is, the gap depth is between the standard center value and the standard upper limit). . At this stage, the medium facing surface of the glass 31 is the medium facing surface of the slider!
It is recessed by 70.05 to 0.15 μm. This glass 31
Alumina was sputtered onto the entire medium facing surface including the medium facing surface by F sputtering at a sputtering rate of 1.5 μm/hour. Thereafter, the medium facing surfaces 11 and 12 were polished until the medium facing surface of the magnetic core 20 and the medium facing surface of the slider 10 were exposed, thereby obtaining the magnetic head slider shown in FIG.

The magnetic head slider of the present invention has a magnetic core 2 as described above.
Since there is no recess on the medium facing surface around 0, negative air pressure will not be generated at this location in the floating head slider. Therefore, if the magnetic head slider loses its desired flying posture and collides with the medium, the dust accumulated in the recessed area will be blown onto the medium! ! This prevents the risk of damaging the media by touching it.

The above configuration suggests the possibility of realizing an even lower flying height in a floating head slider.

Further, even in a head slider of a type that slides on a flexible male air medium such as a magnetic tape or a flexible disk, damage to the medium due to the edges of the magnetic core 20 can be prevented since there is no recess.

〔Effect of the invention〕

As explained above, the present invention provides a magnetic head slider in which a magnetic core is fixed to a non-magnetic slider with resin or glass, and an alumina layer is formed on the W fat or glass around the magnetic field on the medium facing surface. As a result, it is possible to eliminate dents on the medium facing surface around the magnetic core, and to provide a magnetic head slider with less risk of damaging the medium.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the magnetic head slider of the present invention, Fig. 2 is a sectional view taken along line AA in Fig. 1, Figure 3 is a perspective view showing a conventional magnetic head slider, and Fig. 4 is a sectional view taken along line AA in Fig. 3. FIG. lO...Slider, 11.12...Medium facing surface, 20...Magnetic core, 31...
・Glass, 33-・・・Aray 1 Σ 22nd

Claims (1)

[Claims] In a magnetic head slider in which a magnetic core made of a magnetic material is fixed to a non-magnetic slider with resin or glass, an alumina layer is formed on the resin or glass around the magnetic core in the direction opposite to the medium of the magnetic head slider. A magnetic head slider featuring: